1. Used to ignore the negative aspects of a previous statement or comment.
2. To be used after a long period of laughter on a stupid/lame joke.
3. Used to piss someone off after they have spoken.
a) "Shit! You nearly hit that old guy!" (relpy) "hehe.... yeeeeah"
b) "Washing machines turn me on"
(reply) "hehehehe, hehehe, hehe, he, yeeeeah.."